agenda-libre-ruby/app/admin/dashboard.rb

ActiveAdmin.register_page "Dashboard" do
  menu priority: 1, label: proc{ I18n.t("active_admin.dashboard") }

  content title: proc{ I18n.t("active_admin.dashboard") } do
    columns do
      column do
        panel "Contributeurs" do
          ul do
            User.all.map do |user|
              li link_to("#{user.firstname} #{user.lastname} (#{user.login})", user)
            end
          end
        end
      end

      column do
        panel "Commentaires" do
          ul do
            ActiveAdmin::Comment.all.map do |comment|
              li link_to(comment.author.email, admin_admin_user_path(comment.author))
            end
          end
        end
      end
    end
  end
end